221020230 has 32 divisors (see below), whose sum is σ = 561652704. Its totient is φ = 55471616.

The previous prime is 221020211. The next prime is 221020237. The reversal of 221020230 is 32020122.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216177 + ... + 217196.

It is an arithmetic number, because the mean of its divisors is an integer number (17551647).

Almost surely, 2^221020230 is an apocalyptic number.

221020230 is an abundant number, since it is smaller than the sum of its proper divisors (340632474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221020230 is a wasteful number, since it uses less digits than its factorization.

221020230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433400.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 221020230 is about 14866.7491402795. The cubic root of 221020230 is about 604.6128069176.

Adding to 221020230 its reverse (32020122), we get a palindrome (253040352).

The spelling of 221020230 in words is "two hundred twenty-one million, twenty thousand, two hundred thirty".